Finding the Fourth Proportional to 21,870.90, 30,189.14 and 14,698.42

Step by Step Solution

1. Step 1: Write the proportion equation
   21,870.90 : 30,189.14 = 14,698.42 : x
2. Step 2: Convert to fraction form
   21,870.90/30,189.14 = 14,698.42/x
3. Step 3: Cross multiply
   21,870.90x = 30,189.14 × 14,698.42
4. Step 4: Simplify right side
   21,870.90x = 443,732,565.31
5. Step 5: Solve for x
   x = 443,732,565.31/21,870.90
6. Step 6: Final answer
   x = 20,288.72